Centrifuge

ABSTRACT

A centrifuge comprising a housing, a drum, and a knife for stripping a layer of material centrifuged; a knife carrier journalled in a holding part being pivotable mounted in said housing; the journal axis and the pivot axis being parallel to, and apart from each other; a guiding part being guided on said knife carrier so as to be translatorily displaceable relatively to said knife carrier, as well as being guided on said housing so as to be translatorily displaceable relatively to said housing.

United States Patent 1191 Hausmann June 18, 1974 'CENTRIFUGE 2,894,634 7/1959 Lepoutre et al. 210/375 H H 3,338,418 8/1967 Koslowski et a] 210/375 [75] Inventor-1 'I gen, 1 3,446,431 5/1969 Marchal et a] 233/19 R Switzerland 1 FOREIGN PATENTS OR APPLICATIONS [73] Asslgnee" Zunch 1,017,985 10/1957 Germany .1 233/6 [22] Filed: Jan. 22, 1973 Primary Examiner-George I-I. Krizmanich Attorne A ent, 0 Firm-Austin P. Dod e; Robert A. 21 Appl. No.: 325,139 ostmanfl g g [30] Foreign Application Priority Data H ABSTRACT Jan. 24, 1972 Switzerland .j. 967/72 A cen rifuge omp si g a o ng, a u a a knife for stripping a layer of material centrifuged; a [52] US. Cl 233/7, 233/19 A, 210/375 knife arrie j umalled in a holding part being pivot- [51] Int. Cl B04b 11/08 a l m unt n said g; the journal axis and h [58] Field of Search 233/1 R, 6, 7, 27, 28, p ot is e g p a and apart from each other; 233/19 A, 46, 21, 22, 19 R; 210/374; 375, 376 a guiding part being guided on said knife carrier so as to be translatorily displaceable relatively to said knife [56] References Cited carrier, as well as being guided on said housing so as UNITED STATES PATENTS to be translatorily displaceable relatively to said hous- 774,s21 11/1904 Berrigan 233/7 2,230,013 9 Claims, 6 Drawing Figures l/l94l Pecker 233/46 X 1 CENTRIFUGE BACKGROUND OF THE INVENTION Stripping centrifuges are known in the prior "art in which a stripping knife is supported inside the centrifuge drum. My copending application Ser. No. 205,021 filed May 29, 1973 now US Pat. No. 3,735,920 and belonging to the assignee of this application shows several forms of mounting and guiding means for such a stripping knife in which the knife blade is movable to vary its radial spacing from the drum surface, but in which the blade maintains a constant or substantially constant cutting or stripping angle.

SUMMARY OF THE INVENTION The present invention relates to a simpler and more compact support and guide means for a stripping knife.

This object is achieved according to the invention by the fact that a guiding part is provided which, on the one hand, is displaceably guided relatively to the knife support along a first straight line and which, on the other hand, is displaceably guided relatively to the housing along a second straight line, the straight lines having directions. which differ from one another and lying in one plane or each lying in a different plane, the different planes being perpendicular to the axis of the knife carrier.

It is possible in this way for the guiding arrangement for the knife carrier to be of very compact construction.

BRIEF DESCRIPTION OF THE DRAWING The invention is hereinafter explained by way of example and by reference to the drawing, wherein:

FIG. 1 is a longitudinal section through one constructional form of a stripping centrifuge according to the invention, given as an example,

FIG. 2 is a section on an enlarged scale along the line Il-II in FIG. 1 for showing the guide arrangement of the stripping knife,

FIG. 3 is a section along the line IIIIII of FIG. 2,

FIG. 4 is a section similar to FIG. 2 for showing a second example of the guiding arrangement for the strip- I ping knife,

DESCRIPTION OF THE PREFERRED EMBODIMENTS The stripping centrifuge whichis shown in FIG. 1, 2 and 3 comprises a housing 2 which is provided with a housing cover 1 and within which a centrifuge drum 3 is rotatably arranged. Disposed inside the centrifuge 2 drum 3 is a knife carrier 5 which has a stripping knife 6, which extends over the entire internal width of the centrifuge drum 3. The holding part 4 is mounted on the housing 2 and is rotatable about axis 8 (See FIG. 3). This axis 8 extends parallel to the axis 7 of the centrifuge drum.

The carrier shaft 9 of the knife carrier 5 is mounted eccentrically in the holding part 4 and is impositively connected through a connecting part 10 rigidly connected to it to a guiding part 12 which includes first guide means for displacement along a guide rod 11 extending at right-angles to the carrier shaft 9 and in the direction of displacement of the said part 12. The connecting part 10 is in its turn displaceably connected to the guiding part 12 through the second guide means or bush 13 along a straight line 14 extending at rightangles to the carrier shaft 9.

For displacing the guiding part 12 and 'thus the knife carrier 5, the guiding part 12 is connected to a doubleacting servomotor 15, as will be seen from FIG. 1.

'If the guiding part 12 is displaced by means of the servomotor 15 along the guide rod 11, then there is a displacement of the knife carrier 5 parallel thereto, a rotation of the holding part 4 and a displacement of the connecting part 10 in the guide bush 13 of the guiding part 12. In this way, with a displacement of the guiding part 12 and thus of the knife carrier 5, there is no rotation of the carrier shaft 9 in relation to the connecting part 10 and the centrifuge housing 2. Since the holding part 4 has a cylindrical external surface, it can in a simple manner be rotatably mounted in the centrifuge housing and sealed off.

It is also possible for the servomotor 15 to be connected, for example, to the holding part 4 instead of to the guiding part 12. See FIG. 4.

FIG. 4 is a section similar to FIG. 2 also illustrating another example of a constructional form of the guiding arrangement for the stripping knife.

With this stripping knife guide arrangement, the connecting part 10' is connected rigidly to the guiding part 12 and is extended in a displaceable manner through a guide bush 13' connected fast to the carrier shaft 9. The other parts are constructed in the same way as with the constructional example shown in FIG. 1 to 3.

If the carrier shaft 19 is constructed as a hollow sleeve, as shown in FIG. 5, and the knife carrier 5 is connected to a knife shaft 16 which is guided to be axially displaceable but nonrotatable relatively to the hollow shaft, the guide arrangement of the stripping knife can also be used for a stripping knife 6 which is displaceable axially in the drum 3. The servomotor 17 for the displacement of the stripping knife 6 can then be connected, on the one hand, to the knife shaft 16 and,

on the other hand, to the hollow sleeve 19. As in case of the FIG. I embodiment the servomotor may be connected to the rotary holding part 4 rather than to the sleeve 19.

With the constructional form according to FIG. 6,

theguiding part 12, for the guiding action along the secondstraight line (in the vertical direction) is rigidly connected to a guide rod 11, which is in its turn displaceably guided in the housing 1. The guide .rod 11 is connected to a piston of a doubleacting servomotor 20 and forms the piston rod of the servomotor 20.

I claim:

1. A centrifuge 1 comprising a housing 2, a drum 3, rotatable mounted in said housing 2, and a stripping knife 6 arranged in said drum; a knife carrier carrying said stripping knife; said knife carrier including a shaft; a holding part 4 in which said shaft is joumalled; said holding part being mounted to rotate on said housing; the axis ofsaid shaft and the axis of rotation 8 of said holding part being parallel to, and apart from each other, said axis being parallel with the axis of rotation of the drum; a guiding part 12, 12 reacting between said housing and said knife carrier; first guide means 10 to guide said guiding part so that the guiding part is translatorily displaceable relatively to said knife carrier along a first straight line; and second guide means 11, 11' to guide said guiding part so the guiding part is translatorily displaceable relatively to said housing along a second straight line; said straight lines having directions which differ from each other; each of said straight lines lying in a plane extending at right-angles to said shaft.

which a servomotor is connected with said guiding part for the displacement of. said guiding part.

5. Centrifuge according to claim 1 in which said second guide means comprises a bore in said guiding part; and a guide rod rigidly connected to said housing, guided in said bore.

6. Centrifuge according to claim 1, in which said second guide means comprises a guide rod 11 rigidly connected to said guiding part 12 said rod being guided by said housing.

7. Centrifuge according to claim 6; and a servomotor mounted on the housing and connected to and serving to guide said guide rod.

8. Centrifuge according to claim 1, in which a servomotor is connected to said holding part for rotation of said holding part.

9. Centrifuge according to claim 1 in which said shaft is made as a sleeve; a knife shaft connected to said knife carrier, said knife shaft being guided so as to be axially displaceable but non-rotatable relatively to said sleeve; and adjustment means being provided for the axial displacement of said knife shaft relatively to said sleeve. 

1. A centrifuge 1 comprising a housing 2, a drum 3, rotatable mounted in said housing 2, and a stripping knife 6 arranged in said drum; a knife carrier 5 carrying said stripping knife; said knife carrier including a shaft; a holding part 4 in which said shaft is journalled; said holding part being mounted to rotate on said housing; the axis of said shaft and the axis of rotation 8 of said holding part being parallel to, and apart from each other, said axis being parallel with the axis of rotation of the drum; a guiding part 12, 12'' reacting between said housing and said knife carrier; first guide means 10 to guide said guiding part so that the guiding part is translatorily displaceable relatively to said knife carrier along a first straight line; and second guide means 11, 11'' to guide said guiding part so the guiding part is translatorily displaceable relatively to said housing along a second straight line; said straight lines having directions which differ from each other; each of said straight lines lying in a plane extending at right-angles to said shaft.
 2. Centrifuge according to claim 1; and a connecting part 10'' guided by said first guide means and extending between said guiding part and said shaft.
 3. Centrifuge according to claim 2, in which said connecting part is connected fast to said guiding part and displaceable to said shaft.
 4. Centrifuge according to claim 2, characterised in which a servomotor is connected with said guiding part for the displacement of said guiding part.
 5. Centrifuge according to claim 1 in which said second guide means comprises a bore in said guiding part; and a guide rod rigidly connected to said housing, guided in said bore.
 6. Centrifuge according to claim 1, in which said second guide means comprises a guide rod 11 rigidly connected to said guiding part 12'' said rod being guided by said housing.
 7. Centrifuge according to claim 6; and a servomotor mounted on the housing and connected to and serving to guide said guide rod.
 8. Centrifuge according to claim 1, in which a servomotor is connected to said holding part for rotation of said holding part.
 9. Centrifuge according to claim 1 in which said shaft is made as a sleeve; a knife shaft connected to said knife carrier, said knife shaft being guided so as to be axially displaceable but non-rotatable relatively to said sleeve; and adjustment means being provided for the axial displacement of said knife shaft relatively to said sleeve. 